I believe you, but can you please name and shame? I'd hate to accidentally purchase hardware which by design makes entering firmware setup impossible[1]. With online ordering this isn't always something you can check in advance.
[1] I'm assuming that if a working OS install is required to access it, should anything go wrong you're screwed.
The Microsoft spec says that any fallback to the Windows rescue environment should trigger full USB enumeration. The Samsung Series 5 I tested had this behaviour, but given I had to return it after managing to kill the firmware I can't give you the exact model number…
[1] I'm assuming that if a working OS install is required to access it, should anything go wrong you're screwed.